|Publication number||US4969523 A|
|Application number||US 07/365,286|
|Publication date||Nov 13, 1990|
|Filing date||Jun 12, 1989|
|Priority date||Jun 12, 1989|
|Also published as||CA2008752A1, DE69002878D1, DE69002878T2, EP0402996A1, EP0402996B1|
|Publication number||07365286, 365286, US 4969523 A, US 4969523A, US-A-4969523, US4969523 A, US4969523A|
|Inventors||James W. Martin, Tommy E. Hudson|
|Original Assignee||Dowell Schlumberger Incorporated|
|Export Citation||BiBTeX, EndNote, RefMan|
|Patent Citations (10), Referenced by (73), Classifications (8), Legal Events (6)|
|External Links: USPTO, USPTO Assignment, Espacenet|
This invention relates to the art of subterranean well completions and, more particularly, to an improved means and method for placement of a filtering medium in a wellbore annulus and/or perforations which permits the passage of well fluids into the wellbore but restrains the transport into the wellbore of particulate materials present in the formation.
The practice of so-called gravel packing a well in order to substantially block the flow of formation particulates into a wellbore while permitting the free flow of formation fluids has long been used. In such a technique, a particulate material is injected between the earth formation and a point in the wellbore. The particle size range of the particles is preselected and the particles are injected in such a manner that the packed particles will allow the flow of the desired fluid (the term being used to include liquids and/or gases) between the formation and the wellbore.
In carrying out a typical wellbore packing operation, a screen is first placed at a position in the wellbore which is within the desired fluid-bearing formation. In completed wells, a perforated steel casing is usually present between the screen and the formation. A slurry of particulate material in a carrier liquid is then pumped into the wellbore so as to place the particulate material between the screen and the casing (or the formation if no casing is present), as well as into the perforations of any casing, and also into any open area which may extend beyond the perforated casing into the formation. Thus, the aim of packing in most cases is to completely fill the area between the screen assembly and the formation with the particulate material. In some cases, this open area is packed with particulate material before placing the screen in the well. Such a technique is often referred to as prepacking such as described in U.S. Pat. No. 3,327,783.
The particulate material is typically gravel having a density (Dp) of about 2.65 grams per cubic centimeter (g/cm3). The carrier liquid is generally water with a density (Dc) of 1 g/cm3. The gravel particle size range is generally 20 mesh (all mesh sizes, U.S. mesh unless otherwise specified) to 40 mesh (841 microns to 420 microns) or 40 mesh to 60 mesh (420 microns to 250 microns). The resulting density ratio of particulate material to carrier liquid (Dp /Dc), is about 2.65/1.
many cases the overall packing efficiency (the percentage of the total volume of all of the area between the screen and the formation that is filled with gravel) is less than 100%. This is particularly true for deviated wells and especially for highly deviated wells (those deviating from the vertical at an angle more than 45 degrees) and horizontal wells. Of course, the lower the packing efficiency, the greater the likelihood of low production of well fluids or low injection rates and/or sand movement from the formation into the wellbore and production string.
In recent times, such as in copending U.S. application Ser. No. 905,355 filed Sept. 9, 1986, now abandoned, it has been suggested that the efficiencies of gravel pack operations can be improved by the use of particulate materials and carrier liquids with more closely matched density (Dp /Dc approaching 1/1), particularly in deviated wellbores. This technique results in improved packing efficiencies for, particularly, the upper portions of the packed interval as well as the top perforations in a highly deviated or horizontal wellbore since the particles are essentially neutrally buoyant in the carrier liquid and thus are transported more efficiently to the top portions of a wellbore and perforations. However, the cost of these specialized materials greatly exceeds the cost of simple sand packing materials.
The present invention provides a lower cost method for efficiently gravel packing both the lower and upper perforations and portions of the wellbore annulus.
In accordance with the invention, a method for gravel packing a well comprises injecting into a wellbore a slurry of particulate material in a carrier liquid, the particulate material comprising at least first particles having a first density less than the density of the carrier liquid and second particles having a second density which is greater than the density of the carrier liquid. The slurry is strained so that the particles produce a packed mass adjacent the formation, which packed mass will allow flow of fluids therethrough between the formation and the wellbore while substantially preventing particulate material from the formation passing therethrough and into the wellbore.
Further in accordance with the invention, the above method comprises simultaneously injecting the first and second particles.
Still further in accordance with the invention, the above method includes the steps of sequentially injecting the first and second particles.
It is therefore an object of this invention to provide a method whereby the efficiency of gravel packing operations in both upper and lower portions of the wellbore and perforations is greatly increased over prior art methods while lowering the expense of such prior operations of substantially equal efficiency.
It is yet another object of this invention to provide an improved method of inexpensive and efficiently placing a gravel pack in the wellbore and perforations of a highly deviated or horizontal well.
The invention will now be described in the more limited aspects of a preferred embodiment thereof and in conjunction with the accompanying drawing forming a part of this specification and in which the sole FIGURE illustrates a model wellbore in which a gravel packing in accordance with the present invention may be placed.
In order to ascertain the effects of having particles of differing densities relative to the carrier fluid in a wellbore, a transparent plastic test model was used. The model basically emulated, in plastic, many components of a cased well prepared for packing. The model included an elongated hollow tube serving as a casing 2, with a number of tubes extending radially therefrom, acting as perforations 4. Perforation chamber 6 communicate with each perforation 4. For simplicity, only one perforation 4 and its corresponding chamber 6 is shown in this FIGURE. However, the model had a total of 20 perforations, arranged in 5 sets. Each set consists of 4 co-planar perforations spaced 90 degrees apart from another, the sets being spaced 1 foot apart along a 5 foot section of the hollow tube serving as the casing 2, starting 1 foot from the bottom of the model. Each perforation has a perforation chamber 6 in communication therewith. The model further had a wire screen 8 extending from a blank pipe 10 and a wash pipe 12 extending into the screen 8. The annular space between the screen 8 and the casing 2 defines a screen-casing annulus. The entire model was arranged so that it could dispose at various angles to the vertical.
The particles used in accordance with the invention desirably have a Krumbein roundness and sphercity of at least about 0.5 and, preferably, at least about 0.6; i.e., the particles have a roundness and sphercity as determined by using the chart provided for estimating roundness and sphercity in the Text Stratigraphy and Sedimentation, Second Edition, 1963, W. C. Krumbein and L. L. Sloss, published by W. H. Freeman & Company, San Francisco, Calif. U.S.A. The particles have a density within the range of about 0.7 to about 4.0 and, preferably, from about 0.8 to about 2.65. Most preferably, a first particle has a density selected from the lower portion of the density range and the second particle has a density selected from the upper portion of the density range. The particles are preferably each selected from a group consisting of thermoplastic beads prepared from polyolefins, polystyrenedivinylbenzine (SVDB), polyfluoro carbons, polyether etherketones and polyamide imides, ceramic beads, encapsulated ceramic beads, petroleum coke, pyrocarbon-coated ceramics, pyrocarbon-coated petroleum coke, coke, bauxite and sand. The particles used in this process must meet all of the specifications set forth for gravel in accordance with API RP 58.
Of the many liquids which may be used as the carrier fluid, water and/or brines are preferred, either viscosified or unviscosified, but usually the former. The liquid may contain additives for friction reduction which may also act as viscosifiers. Viscosifiers may include any common natural or synthetic viscosifiers such as polysaacharides, modified polysaacharides, acrylamide polymers, viscoelastic surfactants, and the like.
In pumping the different density particles, one preferred method comprises pumping the particles simultaneously as a blend of particles, the low density particles being present in a range of 10 to 90% and the high density particles being present in a range of 90 to 10%. More preferably, in the interest of lowering the overall cost of the gravel pack, an acceptable gravel pack is formed from a mixture of particles wherein the low density particles comprise 25 to 50% of the blend with the high density particles comprising 50 to 75% of the particulate blend.
As an alternative to pumping the particles as a blend, the differing density particles may be pumped separately as distinct slugs of slurry, each slug containing particles having either a low or high density.
In order to determine the pack efficiency of a blend of low density and high density particles, comparative tests were run in the model shown in the FIGURE using sand having a density of 2.65 alone, styrenedivinylbenzine beads alone having a density of 1.05 and a 50-50 mixture of sand and SDVB beads. The particle size was 20 to 40 mesh for the sand and 18 to 50 mesh for the SDVB beads. The results are shown in Table I.
TABLE I______________________________________ 50:50Description Sand Sand:SDVB SDVB______________________________________Annulus 100% 100% 100%Perforation 65 95 100Perf. Chamber 10 15 54______________________________________
It can be seen that the pack efficiency in the perforations was greatly improved by the substitution of 50% SDVB beads for sand and that such packing efficiency in the perforations was nearly as good as that when 100% SDVB beads were used but utilizing only half of the considerably more expensive SDVB material. High packing efficiency within the perforations relates directly to the ability of the well to produce well fluids while avoiding the production of formation particulates. This test was run with the model inclined at 75 degrees to the vertical with a pump rate of two barrels per minute in a gravel concentration of 2.5 lbs/gal of fluid.
While the invention has been described in the more limited aspects of a preferred embodiment thereof, other embodiments have been suggested and still others will occur to those skilled in the art upon a reading and understanding of the foregoing specification. It is intended that all such embodiments be included within the scope of this invention as limited only by the appended claims.
|Cited Patent||Filing date||Publication date||Applicant||Title|
|US2207334 *||Mar 20, 1939||Jul 9, 1940||Union Oil Co||Method and apparatus for placing a filter body in a well|
|US2905245 *||Jun 5, 1957||Sep 22, 1959||California Research Corp||Liner packing method|
|US2952318 *||Nov 30, 1953||Sep 13, 1960||Dow Chemical Co||Sand packing a formation|
|US3362475 *||Jan 11, 1967||Jan 9, 1968||Gulf Research Development Co||Method of gravel packing a well and product formed thereby|
|US3675717 *||Jan 13, 1971||Jul 11, 1972||Gulf Research Development Co||Method of gravel packing wells|
|US3891565 *||Jan 17, 1973||Jun 24, 1975||Union Carbide Corp||Gravel packing fluid|
|US4548269 *||Jul 5, 1984||Oct 22, 1985||Chevron Research Company||Steam injection well gravel prepack material of sintered bauxite|
|US4733729 *||Feb 4, 1987||Mar 29, 1988||Dowell Schlumberger Incorporated||Matched particle/liquid density well packing technique|
|US4796701 *||Jul 30, 1987||Jan 10, 1989||Dowell Schlumberger Incorporated||Pyrolytic carbon coating of media improves gravel packing and fracturing capabilities|
|US4817717 *||Dec 28, 1987||Apr 4, 1989||Mobil Oil Corporation||Hydraulic fracturing with a refractory proppant for sand control|
|Citing Patent||Filing date||Publication date||Applicant||Title|
|US5032084 *||Nov 29, 1990||Jul 16, 1991||Kabelmetal Electro Gmbh||Apparatus for providing an electrical conduction path between two contact locations which are rotatable with respect to each other|
|US5058677 *||Sep 20, 1990||Oct 22, 1991||Chevron Research And Technology Company||Two-step method for horizontal gravel packing|
|US5295542 *||Oct 5, 1992||Mar 22, 1994||Halliburton Company||Well gravel packing methods|
|US5341879 *||Mar 23, 1993||Aug 30, 1994||Stone William B||Fine filtration system|
|US5375661 *||Oct 13, 1993||Dec 27, 1994||Halliburton Company||Well completion method|
|US5381864 *||Nov 12, 1993||Jan 17, 1995||Halliburton Company||Well treating methods using particulate blends|
|US5492178 *||Dec 15, 1994||Feb 20, 1996||Halliburton Company||Well treating methods and devices using particulate blends|
|US5582250 *||Nov 9, 1995||Dec 10, 1996||Dowell, A Division Of Schlumberger Technology Corporation||Overbalanced perforating and fracturing process using low-density, neutrally buoyant proppant|
|US6059034 *||May 27, 1998||May 9, 2000||Bj Services Company||Formation treatment method using deformable particles|
|US6330916||Mar 6, 2000||Dec 18, 2001||Bj Services Company||Formation treatment method using deformable particles|
|US6364018||May 25, 2000||Apr 2, 2002||Bj Services Company||Lightweight methods and compositions for well treating|
|US6439309||Dec 13, 2000||Aug 27, 2002||Bj Services Company||Compositions and methods for controlling particulate movement in wellbores and subterranean formations|
|US6508305||Sep 14, 2000||Jan 21, 2003||Bj Services Company||Compositions and methods for cementing using elastic particles|
|US6588506||May 25, 2001||Jul 8, 2003||Exxonmobil Corporation||Method and apparatus for gravel packing a well|
|US6644406||Jul 31, 2000||Nov 11, 2003||Mobil Oil Corporation||Fracturing different levels within a completion interval of a well|
|US6749025||May 25, 2000||Jun 15, 2004||Bj Services Company||Lightweight methods and compositions for sand control|
|US6772838||Apr 1, 2002||Aug 10, 2004||Bj Services Company||Lightweight particulate materials and uses therefor|
|US6779604 *||May 21, 2001||Aug 24, 2004||Exxonmobil Upstream Research Company||Deformable gravel pack and method of forming|
|US6877560||Jul 19, 2002||Apr 12, 2005||Halliburton Energy Services||Methods of preventing the flow-back of particulates deposited in subterranean formations|
|US6962200||Apr 4, 2003||Nov 8, 2005||Halliburton Energy Services, Inc.||Methods and compositions for consolidating proppant in subterranean fractures|
|US6978836||May 23, 2003||Dec 27, 2005||Halliburton Energy Services, Inc.||Methods for controlling water and particulate production|
|US7013976||Jun 25, 2003||Mar 21, 2006||Halliburton Energy Services, Inc.||Compositions and methods for consolidating unconsolidated subterranean formations|
|US7017665||Aug 26, 2003||Mar 28, 2006||Halliburton Energy Services, Inc.||Strengthening near well bore subterranean formations|
|US7108060||Sep 11, 2003||Sep 19, 2006||Exxonmobil Oil Corporation||Fracturing different levels within a completion interval of a well|
|US7131493||Jan 16, 2004||Nov 7, 2006||Halliburton Energy Services, Inc.||Methods of using sealants in multilateral junctions|
|US7207386||Jun 9, 2004||Apr 24, 2007||Bj Services Company||Method of hydraulic fracturing to reduce unwanted water production|
|US7210528||Mar 18, 2004||May 1, 2007||Bj Services Company||Method of treatment subterranean formations using multiple proppant stages or mixed proppants|
|US7665517||Feb 15, 2006||Feb 23, 2010||Halliburton Energy Services, Inc.||Methods of cleaning sand control screens and gravel packs|
|US7673686||Feb 10, 2006||Mar 9, 2010||Halliburton Energy Services, Inc.||Method of stabilizing unconsolidated formation for sand control|
|US7712531||Jul 26, 2007||May 11, 2010||Halliburton Energy Services, Inc.||Methods for controlling particulate migration|
|US7721801||Feb 2, 2005||May 25, 2010||Schlumberger Technology Corporation||Conveyance device and method of use in gravel pack operation|
|US7757768||Oct 8, 2004||Jul 20, 2010||Halliburton Energy Services, Inc.||Method and composition for enhancing coverage and displacement of treatment fluids into subterranean formations|
|US7762329||Jan 27, 2009||Jul 27, 2010||Halliburton Energy Services, Inc.||Methods for servicing well bores with hardenable resin compositions|
|US7772163||Jan 9, 2008||Aug 10, 2010||Bj Services Company Llc||Well treating composite containing organic lightweight material and weight modifying agent|
|US7819192||Feb 10, 2006||Oct 26, 2010||Halliburton Energy Services, Inc.||Consolidating agent emulsions and associated methods|
|US7883740||Dec 12, 2004||Feb 8, 2011||Halliburton Energy Services, Inc.||Low-quality particulates and methods of making and using improved low-quality particulates|
|US7918277||Dec 31, 2008||Apr 5, 2011||Baker Hughes Incorporated||Method of treating subterranean formations using mixed density proppants or sequential proppant stages|
|US7926591||Jan 12, 2009||Apr 19, 2011||Halliburton Energy Services, Inc.||Aqueous-based emulsified consolidating agents suitable for use in drill-in applications|
|US7934557||Feb 15, 2007||May 3, 2011||Halliburton Energy Services, Inc.||Methods of completing wells for controlling water and particulate production|
|US7938181||Feb 8, 2010||May 10, 2011||Halliburton Energy Services, Inc.||Method and composition for enhancing coverage and displacement of treatment fluids into subterranean formations|
|US7963330||Dec 21, 2009||Jun 21, 2011||Halliburton Energy Services, Inc.||Resin compositions and methods of using resin compositions to control proppant flow-back|
|US7997339||May 12, 2010||Aug 16, 2011||Schlumberger Technology Corporation||Conveyance device and method of use in gravel pack operations|
|US8017561||Apr 3, 2007||Sep 13, 2011||Halliburton Energy Services, Inc.||Resin compositions and methods of using such resin compositions in subterranean applications|
|US8121790||Dec 12, 2008||Feb 21, 2012||Schlumberger Technology Corporation||Combining reservoir modeling with downhole sensors and inductive coupling|
|US8235127||Aug 13, 2010||Aug 7, 2012||Schlumberger Technology Corporation||Communicating electrical energy with an electrical device in a well|
|US8312923||Mar 19, 2010||Nov 20, 2012||Schlumberger Technology Corporation||Measuring a characteristic of a well proximate a region to be gravel packed|
|US8354279||Feb 12, 2004||Jan 15, 2013||Halliburton Energy Services, Inc.||Methods of tracking fluids produced from various zones in a subterranean well|
|US8393390||Jul 23, 2010||Mar 12, 2013||Baker Hughes Incorporated||Polymer hydration method|
|US8443885||Aug 30, 2007||May 21, 2013||Halliburton Energy Services, Inc.||Consolidating agent emulsions and associated methods|
|US8613320||Feb 15, 2008||Dec 24, 2013||Halliburton Energy Services, Inc.||Compositions and applications of resins in treating subterranean formations|
|US8689872||Jul 24, 2007||Apr 8, 2014||Halliburton Energy Services, Inc.||Methods and compositions for controlling formation fines and reducing proppant flow-back|
|US8839850||Oct 4, 2010||Sep 23, 2014||Schlumberger Technology Corporation||Active integrated completion installation system and method|
|US8936083||Aug 28, 2012||Jan 20, 2015||Halliburton Energy Services, Inc.||Methods of forming pillars and channels in propped fractures|
|US8960284||Aug 29, 2012||Feb 24, 2015||Halliburton Energy Services, Inc.||Methods of hindering the settling of proppant aggregates|
|US9175523||Sep 23, 2011||Nov 3, 2015||Schlumberger Technology Corporation||Aligning inductive couplers in a well|
|US9175560||Jan 26, 2012||Nov 3, 2015||Schlumberger Technology Corporation||Providing coupler portions along a structure|
|US9249559||Jan 23, 2012||Feb 2, 2016||Schlumberger Technology Corporation||Providing equipment in lateral branches of a well|
|US20020011334 *||May 21, 2001||Jan 31, 2002||Biegler Mark W.||Deformable gravel pack|
|US20030188872 *||Apr 4, 2003||Oct 9, 2003||Nguyen Philip D.||Methods and compositions for consolidating proppant in subterranean fractures|
|US20040014608 *||Jul 19, 2002||Jan 22, 2004||Nguyen Philip D.||Methods of preventing the flow-back of particulates deposited in subterranean formations|
|US20040050551 *||Sep 11, 2003||Mar 18, 2004||Exxonmobil Oil Corporation||Fracturing different levels within a completion interval of a well|
|US20050016732 *||Jun 9, 2004||Jan 27, 2005||Brannon Harold Dean||Method of hydraulic fracturing to reduce unwanted water production|
|US20060037751 *||Feb 2, 2005||Feb 23, 2006||Schlumberger Technology Corporation||Conveyance Device and Method of Use in Gravel Pack Operations|
|US20070193746 *||Apr 13, 2007||Aug 23, 2007||Bj Services Company||Method of hydraulic fracturing to reduce unwanted water productions|
|US20090182509 *||Dec 12, 2008||Jul 16, 2009||Schlumberger Technology Corporation||Combining reservoir modeling with downhole sensors and inductive coupling|
|US20100186953 *||Mar 19, 2010||Jul 29, 2010||Schlumberger Technology Corporation||Measuring a characteristic of a well proximate a region to be gravel packed|
|US20100200291 *||Apr 26, 2010||Aug 12, 2010||Schlumberger Technology Corporation||Completion system having a sand control assembly, an inductive coupler, and a sensor proximate to the sand control assembly|
|US20100218948 *||May 12, 2010||Sep 2, 2010||Schulumberger Technology Corporation||Conveyance Device and Method of Use in Gravel Pack Operations|
|US20110079400 *||Oct 4, 2010||Apr 7, 2011||Schlumberger Technology Corporation||Active integrated completion installation system and method|
|US20110192596 *||Feb 5, 2011||Aug 11, 2011||Schlumberger Technology Corporation||Through tubing intelligent completion system and method with connection|
|US20120183687 *||Mar 29, 2012||Jul 19, 2012||Halliburto Energy Services, Inc.||Methods for Reducing Particulate Density|
|CN104420857A *||Sep 4, 2013||Mar 18, 2015||中国石油天然气股份有限公司||Gravel filling method and gravel layer of a direction well|
|EP0773343A2||Nov 8, 1996||May 14, 1997||Sofitech N.V.||Extreme overbalanced perforating and fracturing process using low-density, neutrally buoyant proppant|
|U.S. Classification||166/278, 166/50|
|International Classification||C09K8/56, E21B43/04|
|Cooperative Classification||E21B43/04, C09K8/56|
|European Classification||C09K8/56, E21B43/04|
|Aug 10, 1989||AS||Assignment|
Owner name: DOWELL SCHLUMBERGER INCORPORATED
Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNORS:MARTIN, JAMES W.;HUDSON, TOMMY E.;REEL/FRAME:005109/0814;SIGNING DATES FROM 19890731 TO 19890803
Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:MARTIN, JAMES W.;HUDSON, TOMMY E.;SIGNING DATES FROM 19890731 TO 19890803;REEL/FRAME:005109/0814
Owner name: DOWELL SCHLUMBERGER INCORPORATED,OKLAHOMA
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